Postfix manual - qmqpd(8)

    QMQPD(8)                                                              QMQPD(8)

    NAME
           qmqpd - Postfix QMQP server

    SYNOPSIS
           qmqpd [generic Postfix daemon options]

    DESCRIPTION
           The  Postfix  QMQP server receives one message per connec-
           tion.  Each message is piped through the  cleanup(8)  dae-
           mon,  and  is placed into the incoming queue as one single
           queue file.  The program expects to be run from  the  mas-
           ter(8) process manager.

           The QMQP server implements one access policy: only explic-
           itly authorized client hosts are allowed to use  the  ser-
           vice.

    SECURITY
           The QMQP server is moderately security-sensitive. It talks
           to QMQP clients and to DNS servers  on  the  network.  The
           QMQP server can be run chrooted at fixed low privilege.

    DIAGNOSTICS
           Problems and transactions are logged to syslogd(8).

    BUGS
           The  QMQP protocol provides only one server reply per mes-
           sage delivery. It is  therefore  not  possible  to  reject
           individual recipients.

           The  QMQP  protocol  requires  the  server  to receive the
           entire message before replying. If a message is malformed,
           or  if  any netstring component is longer than acceptable,
           Postfix replies immediately and closes the connection.  It
           is left up to the client to handle the situation.

    CONFIGURATION PARAMETERS
           Changes   to  main.cf  are  picked  up  automatically,  as
           qmqpd(8) processes run for only a limited amount of  time.
           Use the command "postfix reload" to speed up a change.

           The  text  below  provides  only  a parameter summary. See
           postconf(5) for more details including examples.

    CONTENT INSPECTION CONTROLS
           content_filter (empty)
                  The name of a mail delivery transport that  filters
                  mail after it is queued.

           receive_override_options (empty)
                  Enable  or  disable  recipient validation, built-in
                  content filtering, or address mapping.

    RESOURCE AND RATE CONTROLS
           line_length_limit (2048)
                  Upon input, long lines are chopped up  into  pieces
                  of  at  most this length; upon delivery, long lines
                  are reconstructed.

           hopcount_limit (50)
                  The maximal number of  Received:   message  headers
                  that is allowed in the primary message headers.

           message_size_limit (10240000)
                  The  maximal  size in bytes of a message, including
                  envelope information.

           qmqpd_timeout (300s)
                  The time limit for sending or receiving information
                  over the network.

    TROUBLE SHOOTING CONTROLS
           debug_peer_level (2)
                  The  increment  in  verbose  logging  level  when a
                  remote client or server matches a  pattern  in  the
                  debug_peer_list parameter.

           debug_peer_list (empty)
                  Optional  list  of remote client or server hostname
                  or network address patterns that cause the  verbose
                  logging  level  to increase by the amount specified
                  in $debug_peer_level.

           soft_bounce (no)
                  Safety net to keep mail queued that would otherwise
                  be returned to the sender.

    TARPIT CONTROLS
           qmqpd_error_delay (1s)
                  How  long the QMQP server will pause before sending
                  a negative reply to the client.

    MISCELLANEOUS CONTROLS
           config_directory (see 'postconf -d' output)
                  The default location of  the  Postfix  main.cf  and
                  master.cf configuration files.

           daemon_timeout (18000s)
                  How  much time a Postfix daemon process may take to
                  handle a request  before  it  is  terminated  by  a
                  built-in watchdog timer.

           ipc_timeout (3600s)
                  The time limit for sending or receiving information
                  over an internal communication channel.

           max_idle (100s)
                  The maximum amount of time  that  an  idle  Postfix
                  daemon  process  waits  for  an incoming connection
                  before terminating voluntarily.

           max_use (100)
                  The maximal number of incoming connections  that  a
                  Postfix  daemon  process will service before termi-
                  nating voluntarily.

           process_id (read-only)
                  The process ID  of  a  Postfix  command  or  daemon
                  process.

           process_name (read-only)
                  The  process  name  of  a Postfix command or daemon
                  process.

           qmqpd_authorized_clients (empty)
                  What clients are allowed to  connect  to  the  QMQP
                  server port.

           queue_directory (see 'postconf -d' output)
                  The  location of the Postfix top-level queue direc-
                  tory.

           syslog_facility (mail)
                  The syslog facility of Postfix logging.

           syslog_name (see 'postconf -d' output)
                  The mail system  name  that  is  prepended  to  the
                  process  name  in  syslog  records, so that "smtpd"
                  becomes, for example, "postfix/smtpd".

           verp_delimiter_filter (-=+)
                  The characters Postfix accepts  as  VERP  delimiter
                  characters  on the Postfix sendmail(1) command line
                  and in SMTP commands.

           Available in Postfix version 2.5 and later:

           qmqpd_client_port_logging (no)
                  Enable logging of the remote QMQP  client  port  in
                  addition to the hostname and IP address.

    SEE ALSO
           http://cr.yp.to/proto/qmqp.html, QMQP protocol
           cleanup(8), message canonicalization
           master(8), process manager
           syslogd(8), system logging

    README FILES
           QMQP_README, Postfix ezmlm-idx howto.

    LICENSE
           The Secure Mailer license must be  distributed  with  this
           software.

    HISTORY
           The qmqpd service was introduced with Postfix version 1.1.

    AUTHOR(S)
           Wietse Venema
           IBM T.J. Watson Research
           P.O. Box 704
           Yorktown Heights, NY 10598, USA

                                                                          QMQPD(8)